Wednesday marks the fifth day since the search began for Charlie Jackson of Deltona and Jason Cobb of Osteen.

The two were last seen before launching their boat at the lake Saturday morning. The boat and two lifejackets were found floating near Bird Island later that day.

The boot matches another that was discovered Sunday floating in the same area.

Deputies believe Jackson and Cobb were somehow thrown overboard and because of the cold temperatures Saturday night, investigators do not believe the men survived.

The water in the vast lake is very murky and there's also a great deal of muck on the bottom. That is why teams are using what's called Sidescan sonar to try to have a better look underwater.

In the past it's proven very successful in these kinds of missions.

Also, making this search problematic is that teams really can't pinpoint the location of where the men may have fallen overboard. That's why they're not using divers. Instead they're dragging parts of the lake and using airboats in shallow areas.

They plan to search by helicopter using a spotlight Wednesday evening.

Every effort is being made to find these missing men and bring their families some sort of resolution. The search officially became a "recovery mission" on Monday.